class_docstr: Check schema name
      
class_docstr_tok: ["Check","schema","name"]
code: def must_be_tuple(cls, v):
      if isinstance(v, str):
          return (v,)
      return v
  
file_path: towhee/towhee/runtime/check_utils.py
imports: from typing import Dict, Any, Set, Tuple, Optional
  import re
  from pydantic import BaseModel, validator
  from towhee.runtime.constants import WindowConst, FilterConst, TimeWindowConst
label_desc: Use image node_id 1 for calling the TupleForm obj's underlying member method code with example usage: obj.must_be_tuple(cls, v) and returns: v, v